1/*
2 * SCSI Primary Commands (SPC) parsing and emulation.
3 *
4 * (c) Copyright 2002-2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@kernel.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <asm/unaligned.h>
26
27#include <scsi/scsi_proto.h>
28#include <scsi/scsi_common.h>
29#include <scsi/scsi_tcq.h>
30
31#include <target/target_core_base.h>
32#include <target/target_core_backend.h>
33#include <target/target_core_fabric.h>
34
35#include "target_core_internal.h"
36#include "target_core_alua.h"
37#include "target_core_pr.h"
38#include "target_core_ua.h"
39#include "target_core_xcopy.h"
40
41static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
42{
43 struct t10_alua_tg_pt_gp *tg_pt_gp;
44
45 /*
46 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
47 */
48 buf[5] = 0x80;
49
50 /*
51 * Set TPGS field for explicit and/or implicit ALUA access type
52 * and opteration.
53 *
54 * See spc4r17 section 6.4.2 Table 135
55 */
56 spin_lock(&lun->lun_tg_pt_gp_lock);
57 tg_pt_gp = lun->lun_tg_pt_gp;
58 if (tg_pt_gp)
59 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
60 spin_unlock(&lun->lun_tg_pt_gp_lock);
61}
62
63sense_reason_t
64spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
65{
66 struct se_lun *lun = cmd->se_lun;
67 struct se_device *dev = cmd->se_dev;
68 struct se_session *sess = cmd->se_sess;
69
70 /* Set RMB (removable media) for tape devices */
71 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
72 buf[1] = 0x80;
73
74 buf[2] = 0x05; /* SPC-3 */
75
76 /*
77 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
78 *
79 * SPC4 says:
80 * A RESPONSE DATA FORMAT field set to 2h indicates that the
81 * standard INQUIRY data is in the format defined in this
82 * standard. Response data format values less than 2h are
83 * obsolete. Response data format values greater than 2h are
84 * reserved.
85 */
86 buf[3] = 2;
87
88 /*
89 * Enable SCCS and TPGS fields for Emulated ALUA
90 */
91 spc_fill_alua_data(lun, buf);
92
93 /*
94 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
95 */
96 if (dev->dev_attrib.emulate_3pc)
97 buf[5] |= 0x8;
98 /*
99 * Set Protection (PROTECT) bit when DIF has been enabled on the
100 * device, and the fabric supports VERIFY + PASS. Also report
101 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
102 * to unprotected devices.
103 */
104 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
105 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
106 buf[5] |= 0x1;
107 }
108
109 buf[7] = 0x2; /* CmdQue=1 */
110
111 /*
112 * ASCII data fields described as being left-aligned shall have any
113 * unused bytes at the end of the field (i.e., highest offset) and the
114 * unused bytes shall be filled with ASCII space characters (20h).
115 */
116 memset(&buf[8], 0x20,
117 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
118 memcpy(&buf[8], dev->t10_wwn.vendor,
119 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
120 memcpy(&buf[16], dev->t10_wwn.model,
121 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
122 memcpy(&buf[32], dev->t10_wwn.revision,
123 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
124 buf[4] = 31; /* Set additional length to 31 */
125
126 return 0;
127}
128EXPORT_SYMBOL(spc_emulate_inquiry_std);
129
130/* unit serial number */
131static sense_reason_t
132spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
133{
134 struct se_device *dev = cmd->se_dev;
135 u16 len;
136
137 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
138 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
139 len++; /* Extra Byte for NULL Terminator */
140 buf[3] = len;
141 }
142 return 0;
143}
144
145void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
146 unsigned char *buf)
147{
148 unsigned char *p = &dev->t10_wwn.unit_serial[0];
149 int cnt;
150 bool next = true;
151
152 /*
153 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
154 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
155 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
156 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL
157 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
158 * per device uniqeness.
159 */
160 for (cnt = 0; *p && cnt < 13; p++) {
161 int val = hex_to_bin(*p);
162
163 if (val < 0)
164 continue;
165
166 if (next) {
167 next = false;
168 buf[cnt++] |= val;
169 } else {
170 next = true;
171 buf[cnt] = val << 4;
172 }
173 }
174}
175
176/*
177 * Device identification VPD, for a complete list of
178 * DESIGNATOR TYPEs see spc4r17 Table 459.
179 */
180sense_reason_t
181spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
182{
183 struct se_device *dev = cmd->se_dev;
184 struct se_lun *lun = cmd->se_lun;
185 struct se_portal_group *tpg = NULL;
186 struct t10_alua_lu_gp_member *lu_gp_mem;
187 struct t10_alua_tg_pt_gp *tg_pt_gp;
188 unsigned char *prod = &dev->t10_wwn.model[0];
189 u32 prod_len;
190 u32 unit_serial_len, off = 0;
191 u16 len = 0, id_len;
192
193 off = 4;
194
195 /*
196 * NAA IEEE Registered Extended Assigned designator format, see
197 * spc4r17 section 7.7.3.6.5
198 *
199 * We depend upon a target_core_mod/ConfigFS provided
200 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
201 * value in order to return the NAA id.
202 */
203 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
204 goto check_t10_vend_desc;
205
206 /* CODE SET == Binary */
207 buf[off++] = 0x1;
208
209 /* Set ASSOCIATION == addressed logical unit: 0)b */
210 buf[off] = 0x00;
211
212 /* Identifier/Designator type == NAA identifier */
213 buf[off++] |= 0x3;
214 off++;
215
216 /* Identifier/Designator length */
217 buf[off++] = 0x10;
218
219 /*
220 * Start NAA IEEE Registered Extended Identifier/Designator
221 */
222 buf[off++] = (0x6 << 4);
223
224 /*
225 * Use OpenFabrics IEEE Company ID: 00 14 05
226 */
227 buf[off++] = 0x01;
228 buf[off++] = 0x40;
229 buf[off] = (0x5 << 4);
230
231 /*
232 * Return ConfigFS Unit Serial Number information for
233 * VENDOR_SPECIFIC_IDENTIFIER and
234 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
235 */
236 spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
237
238 len = 20;
239 off = (len + 4);
240
241check_t10_vend_desc:
242 /*
243 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
244 */
245 id_len = 8; /* For Vendor field */
246 prod_len = 4; /* For VPD Header */
247 prod_len += 8; /* For Vendor field */
248 prod_len += strlen(prod);
249 prod_len++; /* For : */
250
251 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
252 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
253 unit_serial_len++; /* For NULL Terminator */
254
255 id_len += sprintf(&buf[off+12], "%s:%s", prod,
256 &dev->t10_wwn.unit_serial[0]);
257 }
258 buf[off] = 0x2; /* ASCII */
259 buf[off+1] = 0x1; /* T10 Vendor ID */
260 buf[off+2] = 0x0;
261 /* left align Vendor ID and pad with spaces */
262 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
263 memcpy(&buf[off+4], dev->t10_wwn.vendor,
264 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
265 /* Extra Byte for NULL Terminator */
266 id_len++;
267 /* Identifier Length */
268 buf[off+3] = id_len;
269 /* Header size for Designation descriptor */
270 len += (id_len + 4);
271 off += (id_len + 4);
272
273 if (1) {
274 struct t10_alua_lu_gp *lu_gp;
275 u32 padding, scsi_name_len, scsi_target_len;
276 u16 lu_gp_id = 0;
277 u16 tg_pt_gp_id = 0;
278 u16 tpgt;
279
280 tpg = lun->lun_tpg;
281 /*
282 * Relative target port identifer, see spc4r17
283 * section 7.7.3.7
284 *
285 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
286 * section 7.5.1 Table 362
287 */
288 buf[off] = tpg->proto_id << 4;
289 buf[off++] |= 0x1; /* CODE SET == Binary */
290 buf[off] = 0x80; /* Set PIV=1 */
291 /* Set ASSOCIATION == target port: 01b */
292 buf[off] |= 0x10;
293 /* DESIGNATOR TYPE == Relative target port identifer */
294 buf[off++] |= 0x4;
295 off++; /* Skip over Reserved */
296 buf[off++] = 4; /* DESIGNATOR LENGTH */
297 /* Skip over Obsolete field in RTPI payload
298 * in Table 472 */
299 off += 2;
300 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
301 off += 2;
302 len += 8; /* Header size + Designation descriptor */
303 /*
304 * Target port group identifier, see spc4r17
305 * section 7.7.3.8
306 *
307 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
308 * section 7.5.1 Table 362
309 */
310 spin_lock(&lun->lun_tg_pt_gp_lock);
311 tg_pt_gp = lun->lun_tg_pt_gp;
312 if (!tg_pt_gp) {
313 spin_unlock(&lun->lun_tg_pt_gp_lock);
314 goto check_lu_gp;
315 }
316 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
317 spin_unlock(&lun->lun_tg_pt_gp_lock);
318
319 buf[off] = tpg->proto_id << 4;
320 buf[off++] |= 0x1; /* CODE SET == Binary */
321 buf[off] = 0x80; /* Set PIV=1 */
322 /* Set ASSOCIATION == target port: 01b */
323 buf[off] |= 0x10;
324 /* DESIGNATOR TYPE == Target port group identifier */
325 buf[off++] |= 0x5;
326 off++; /* Skip over Reserved */
327 buf[off++] = 4; /* DESIGNATOR LENGTH */
328 off += 2; /* Skip over Reserved Field */
329 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
330 off += 2;
331 len += 8; /* Header size + Designation descriptor */
332 /*
333 * Logical Unit Group identifier, see spc4r17
334 * section 7.7.3.8
335 */
336check_lu_gp:
337 lu_gp_mem = dev->dev_alua_lu_gp_mem;
338 if (!lu_gp_mem)
339 goto check_scsi_name;
340
341 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
342 lu_gp = lu_gp_mem->lu_gp;
343 if (!lu_gp) {
344 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
345 goto check_scsi_name;
346 }
347 lu_gp_id = lu_gp->lu_gp_id;
348 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
349
350 buf[off++] |= 0x1; /* CODE SET == Binary */
351 /* DESIGNATOR TYPE == Logical Unit Group identifier */
352 buf[off++] |= 0x6;
353 off++; /* Skip over Reserved */
354 buf[off++] = 4; /* DESIGNATOR LENGTH */
355 off += 2; /* Skip over Reserved Field */
356 put_unaligned_be16(lu_gp_id, &buf[off]);
357 off += 2;
358 len += 8; /* Header size + Designation descriptor */
359 /*
360 * SCSI name string designator, see spc4r17
361 * section 7.7.3.11
362 *
363 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
364 * section 7.5.1 Table 362
365 */
366check_scsi_name:
367 buf[off] = tpg->proto_id << 4;
368 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
369 buf[off] = 0x80; /* Set PIV=1 */
370 /* Set ASSOCIATION == target port: 01b */
371 buf[off] |= 0x10;
372 /* DESIGNATOR TYPE == SCSI name string */
373 buf[off++] |= 0x8;
374 off += 2; /* Skip over Reserved and length */
375 /*
376 * SCSI name string identifer containing, $FABRIC_MOD
377 * dependent information. For LIO-Target and iSCSI
378 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
379 * UTF-8 encoding.
380 */
381 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
382 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
383 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
384 scsi_name_len += 1 /* Include NULL terminator */;
385 /*
386 * The null-terminated, null-padded (see 4.4.2) SCSI
387 * NAME STRING field contains a UTF-8 format string.
388 * The number of bytes in the SCSI NAME STRING field
389 * (i.e., the value in the DESIGNATOR LENGTH field)
390 * shall be no larger than 256 and shall be a multiple
391 * of four.
392 */
393 padding = ((-scsi_name_len) & 3);
394 if (padding)
395 scsi_name_len += padding;
396 if (scsi_name_len > 256)
397 scsi_name_len = 256;
398
399 buf[off-1] = scsi_name_len;
400 off += scsi_name_len;
401 /* Header size + Designation descriptor */
402 len += (scsi_name_len + 4);
403
404 /*
405 * Target device designator
406 */
407 buf[off] = tpg->proto_id << 4;
408 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
409 buf[off] = 0x80; /* Set PIV=1 */
410 /* Set ASSOCIATION == target device: 10b */
411 buf[off] |= 0x20;
412 /* DESIGNATOR TYPE == SCSI name string */
413 buf[off++] |= 0x8;
414 off += 2; /* Skip over Reserved and length */
415 /*
416 * SCSI name string identifer containing, $FABRIC_MOD
417 * dependent information. For LIO-Target and iSCSI
418 * Target Port, this means "<iSCSI name>" in
419 * UTF-8 encoding.
420 */
421 scsi_target_len = sprintf(&buf[off], "%s",
422 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
423 scsi_target_len += 1 /* Include NULL terminator */;
424 /*
425 * The null-terminated, null-padded (see 4.4.2) SCSI
426 * NAME STRING field contains a UTF-8 format string.
427 * The number of bytes in the SCSI NAME STRING field
428 * (i.e., the value in the DESIGNATOR LENGTH field)
429 * shall be no larger than 256 and shall be a multiple
430 * of four.
431 */
432 padding = ((-scsi_target_len) & 3);
433 if (padding)
434 scsi_target_len += padding;
435 if (scsi_target_len > 256)
436 scsi_target_len = 256;
437
438 buf[off-1] = scsi_target_len;
439 off += scsi_target_len;
440
441 /* Header size + Designation descriptor */
442 len += (scsi_target_len + 4);
443 }
444 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
445 return 0;
446}
447EXPORT_SYMBOL(spc_emulate_evpd_83);
448
449/* Extended INQUIRY Data VPD Page */
450static sense_reason_t
451spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
452{
453 struct se_device *dev = cmd->se_dev;
454 struct se_session *sess = cmd->se_sess;
455
456 buf[3] = 0x3c;
457 /*
458 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
459 * only for TYPE3 protection.
460 */
461 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
462 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
463 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
464 buf[4] = 0x5;
465 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
466 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
467 buf[4] = 0x4;
468 }
469
470 /* logical unit supports type 1 and type 3 protection */
471 if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
472 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
473 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
474 buf[4] |= (0x3 << 3);
475 }
476
477 /* Set HEADSUP, ORDSUP, SIMPSUP */
478 buf[5] = 0x07;
479
480 /* If WriteCache emulation is enabled, set V_SUP */
481 if (target_check_wce(dev))
482 buf[6] = 0x01;
483 /* If an LBA map is present set R_SUP */
484 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
485 if (!list_empty(&dev->t10_alua.lba_map_list))
486 buf[8] = 0x10;
487 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
488 return 0;
489}
490
491/* Block Limits VPD page */
492static sense_reason_t
493spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
494{
495 struct se_device *dev = cmd->se_dev;
496 u32 mtl = 0;
497 int have_tp = 0, opt, min;
498
499 /*
500 * Following spc3r22 section 6.5.3 Block Limits VPD page, when
501 * emulate_tpu=1 or emulate_tpws=1 we will be expect a
502 * different page length for Thin Provisioning.
503 */
504 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
505 have_tp = 1;
506
507 buf[0] = dev->transport->get_device_type(dev);
508 buf[3] = have_tp ? 0x3c : 0x10;
509
510 /* Set WSNZ to 1 */
511 buf[4] = 0x01;
512 /*
513 * Set MAXIMUM COMPARE AND WRITE LENGTH
514 */
515 if (dev->dev_attrib.emulate_caw)
516 buf[5] = 0x01;
517
518 /*
519 * Set OPTIMAL TRANSFER LENGTH GRANULARITY
520 */
521 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
522 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
523 else
524 put_unaligned_be16(1, &buf[6]);
525
526 /*
527 * Set MAXIMUM TRANSFER LENGTH
528 *
529 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
530 * enforcing maximum HW scatter-gather-list entry limit
531 */
532 if (cmd->se_tfo->max_data_sg_nents) {
533 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
534 dev->dev_attrib.block_size;
535 }
536 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
537
538 /*
539 * Set OPTIMAL TRANSFER LENGTH
540 */
541 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
542 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
543 else
544 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
545
546 /*
547 * Exit now if we don't support TP.
548 */
549 if (!have_tp)
550 goto max_write_same;
551
552 /*
553 * Set MAXIMUM UNMAP LBA COUNT
554 */
555 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
556
557 /*
558 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
559 */
560 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
561 &buf[24]);
562
563 /*
564 * Set OPTIMAL UNMAP GRANULARITY
565 */
566 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
567
568 /*
569 * UNMAP GRANULARITY ALIGNMENT
570 */
571 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
572 &buf[32]);
573 if (dev->dev_attrib.unmap_granularity_alignment != 0)
574 buf[32] |= 0x80; /* Set the UGAVALID bit */
575
576 /*
577 * MAXIMUM WRITE SAME LENGTH
578 */
579max_write_same:
580 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
581
582 return 0;
583}
584
585/* Block Device Characteristics VPD page */
586static sense_reason_t
587spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
588{
589 struct se_device *dev = cmd->se_dev;
590
591 buf[0] = dev->transport->get_device_type(dev);
592 buf[3] = 0x3c;
593 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
594
595 return 0;
596}
597
598/* Thin Provisioning VPD */
599static sense_reason_t
600spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
601{
602 struct se_device *dev = cmd->se_dev;
603
604 /*
605 * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
606 *
607 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
608 * zero, then the page length shall be set to 0004h. If the DP bit
609 * is set to one, then the page length shall be set to the value
610 * defined in table 162.
611 */
612 buf[0] = dev->transport->get_device_type(dev);
613
614 /*
615 * Set Hardcoded length mentioned above for DP=0
616 */
617 put_unaligned_be16(0x0004, &buf[2]);
618
619 /*
620 * The THRESHOLD EXPONENT field indicates the threshold set size in
621 * LBAs as a power of 2 (i.e., the threshold set size is equal to
622 * 2(threshold exponent)).
623 *
624 * Note that this is currently set to 0x00 as mkp says it will be
625 * changing again. We can enable this once it has settled in T10
626 * and is actually used by Linux/SCSI ML code.
627 */
628 buf[4] = 0x00;
629
630 /*
631 * A TPU bit set to one indicates that the device server supports
632 * the UNMAP command (see 5.25). A TPU bit set to zero indicates
633 * that the device server does not support the UNMAP command.
634 */
635 if (dev->dev_attrib.emulate_tpu != 0)
636 buf[5] = 0x80;
637
638 /*
639 * A TPWS bit set to one indicates that the device server supports
640 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
641 * A TPWS bit set to zero indicates that the device server does not
642 * support the use of the WRITE SAME (16) command to unmap LBAs.
643 */
644 if (dev->dev_attrib.emulate_tpws != 0)
645 buf[5] |= 0x40 | 0x20;
646
647 /*
648 * The unmap_zeroes_data set means that the underlying device supports
649 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
650 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
651 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
652 * See sbc4r36 6.6.4.
653 */
654 if (((dev->dev_attrib.emulate_tpu != 0) ||
655 (dev->dev_attrib.emulate_tpws != 0)) &&
656 (dev->dev_attrib.unmap_zeroes_data != 0))
657 buf[5] |= 0x04;
658
659 return 0;
660}
661
662/* Referrals VPD page */
663static sense_reason_t
664spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
665{
666 struct se_device *dev = cmd->se_dev;
667
668 buf[0] = dev->transport->get_device_type(dev);
669 buf[3] = 0x0c;
670 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
671 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
672
673 return 0;
674}
675
676static sense_reason_t
677spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
678
679static struct {
680 uint8_t page;
681 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *);
682} evpd_handlers[] = {
683 { .page = 0x00, .emulate = spc_emulate_evpd_00 },
684 { .page = 0x80, .emulate = spc_emulate_evpd_80 },
685 { .page = 0x83, .emulate = spc_emulate_evpd_83 },
686 { .page = 0x86, .emulate = spc_emulate_evpd_86 },
687 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
688 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
689 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
690 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
691};
692
693/* supported vital product data pages */
694static sense_reason_t
695spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
696{
697 int p;
698
699 /*
700 * Only report the INQUIRY EVPD=1 pages after a valid NAA
701 * Registered Extended LUN WWN has been set via ConfigFS
702 * during device creation/restart.
703 */
704 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
705 buf[3] = ARRAY_SIZE(evpd_handlers);
706 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
707 buf[p + 4] = evpd_handlers[p].page;
708 }
709
710 return 0;
711}
712
713static sense_reason_t
714spc_emulate_inquiry(struct se_cmd *cmd)
715{
716 struct se_device *dev = cmd->se_dev;
717 struct se_portal_group *tpg = cmd->se_lun->lun_tpg;
718 unsigned char *rbuf;
719 unsigned char *cdb = cmd->t_task_cdb;
720 unsigned char *buf;
721 sense_reason_t ret;
722 int p;
723 int len = 0;
724
725 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
726 if (!buf) {
727 pr_err("Unable to allocate response buffer for INQUIRY\n");
728 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
729 }
730
731 if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev))
732 buf[0] = 0x3f; /* Not connected */
733 else
734 buf[0] = dev->transport->get_device_type(dev);
735
736 if (!(cdb[1] & 0x1)) {
737 if (cdb[2]) {
738 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
739 cdb[2]);
740 ret = TCM_INVALID_CDB_FIELD;
741 goto out;
742 }
743
744 ret = spc_emulate_inquiry_std(cmd, buf);
745 len = buf[4] + 5;
746 goto out;
747 }
748
749 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
750 if (cdb[2] == evpd_handlers[p].page) {
751 buf[1] = cdb[2];
752 ret = evpd_handlers[p].emulate(cmd, buf);
753 len = get_unaligned_be16(&buf[2]) + 4;
754 goto out;
755 }
756 }
757
758 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
759 ret = TCM_INVALID_CDB_FIELD;
760
761out:
762 rbuf = transport_kmap_data_sg(cmd);
763 if (rbuf) {
764 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
765 transport_kunmap_data_sg(cmd);
766 }
767 kfree(buf);
768
769 if (!ret)
770 target_complete_cmd_with_length(cmd, GOOD, len);
771 return ret;
772}
773
774static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
775{
776 p[0] = 0x01;
777 p[1] = 0x0a;
778
779 /* No changeable values for now */
780 if (pc == 1)
781 goto out;
782
783out:
784 return 12;
785}
786
787static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
788{
789 struct se_device *dev = cmd->se_dev;
790 struct se_session *sess = cmd->se_sess;
791
792 p[0] = 0x0a;
793 p[1] = 0x0a;
794
795 /* No changeable values for now */
796 if (pc == 1)
797 goto out;
798
799 /* GLTSD: No implicit save of log parameters */
800 p[2] = (1 << 1);
801 if (target_sense_desc_format(dev))
802 /* D_SENSE: Descriptor format sense data for 64bit sectors */
803 p[2] |= (1 << 2);
804
805 /*
806 * From spc4r23, 7.4.7 Control mode page
807 *
808 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
809 * restrictions on the algorithm used for reordering commands
810 * having the SIMPLE task attribute (see SAM-4).
811 *
812 * Table 368 -- QUEUE ALGORITHM MODIFIER field
813 * Code Description
814 * 0h Restricted reordering
815 * 1h Unrestricted reordering allowed
816 * 2h to 7h Reserved
817 * 8h to Fh Vendor specific
818 *
819 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
820 * the device server shall order the processing sequence of commands
821 * having the SIMPLE task attribute such that data integrity is maintained
822 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
823 * requests is halted at any time, the final value of all data observable
824 * on the medium shall be the same as if all the commands had been processed
825 * with the ORDERED task attribute).
826 *
827 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
828 * device server may reorder the processing sequence of commands having the
829 * SIMPLE task attribute in any manner. Any data integrity exposures related to
830 * command sequence order shall be explicitly handled by the application client
831 * through the selection of appropriate ommands and task attributes.
832 */
833 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
834 /*
835 * From spc4r17, section 7.4.6 Control mode Page
836 *
837 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
838 *
839 * 00b: The logical unit shall clear any unit attention condition
840 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
841 * status and shall not establish a unit attention condition when a com-
842 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
843 * status.
844 *
845 * 10b: The logical unit shall not clear any unit attention condition
846 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
847 * status and shall not establish a unit attention condition when
848 * a command is completed with BUSY, TASK SET FULL, or RESERVATION
849 * CONFLICT status.
850 *
851 * 11b a The logical unit shall not clear any unit attention condition
852 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
853 * status and shall establish a unit attention condition for the
854 * initiator port associated with the I_T nexus on which the BUSY,
855 * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
856 * Depending on the status, the additional sense code shall be set to
857 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
858 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
859 * command, a unit attention condition shall be established only once
860 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
861 * to the number of commands completed with one of those status codes.
862 */
863 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
864 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
865 /*
866 * From spc4r17, section 7.4.6 Control mode Page
867 *
868 * Task Aborted Status (TAS) bit set to zero.
869 *
870 * A task aborted status (TAS) bit set to zero specifies that aborted
871 * tasks shall be terminated by the device server without any response
872 * to the application client. A TAS bit set to one specifies that tasks
873 * aborted by the actions of an I_T nexus other than the I_T nexus on
874 * which the command was received shall be completed with TASK ABORTED
875 * status (see SAM-4).
876 */
877 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
878 /*
879 * From spc4r30, section 7.5.7 Control mode page
880 *
881 * Application Tag Owner (ATO) bit set to one.
882 *
883 * If the ATO bit is set to one the device server shall not modify the
884 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
885 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
886 * TAG field.
887 */
888 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
889 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
890 p[5] |= 0x80;
891 }
892
893 p[8] = 0xff;
894 p[9] = 0xff;
895 p[11] = 30;
896
897out:
898 return 12;
899}
900
901static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
902{
903 struct se_device *dev = cmd->se_dev;
904
905 p[0] = 0x08;
906 p[1] = 0x12;
907
908 /* No changeable values for now */
909 if (pc == 1)
910 goto out;
911
912 if (target_check_wce(dev))
913 p[2] = 0x04; /* Write Cache Enable */
914 p[12] = 0x20; /* Disabled Read Ahead */
915
916out:
917 return 20;
918}
919
920static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
921{
922 p[0] = 0x1c;
923 p[1] = 0x0a;
924
925 /* No changeable values for now */
926 if (pc == 1)
927 goto out;
928
929out:
930 return 12;
931}
932
933static struct {
934 uint8_t page;
935 uint8_t subpage;
936 int (*emulate)(struct se_cmd *, u8, unsigned char *);
937} modesense_handlers[] = {
938 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
939 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
940 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
941 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
942};
943
944static void spc_modesense_write_protect(unsigned char *buf, int type)
945{
946 /*
947 * I believe that the WP bit (bit 7) in the mode header is the same for
948 * all device types..
949 */
950 switch (type) {
951 case TYPE_DISK:
952 case TYPE_TAPE:
953 default:
954 buf[0] |= 0x80; /* WP bit */
955 break;
956 }
957}
958
959static void spc_modesense_dpofua(unsigned char *buf, int type)
960{
961 switch (type) {
962 case TYPE_DISK:
963 buf[0] |= 0x10; /* DPOFUA bit */
964 break;
965 default:
966 break;
967 }
968}
969
970static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
971{
972 *buf++ = 8;
973 put_unaligned_be32(min(blocks, 0xffffffffull), buf);
974 buf += 4;
975 put_unaligned_be32(block_size, buf);
976 return 9;
977}
978
979static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
980{
981 if (blocks <= 0xffffffff)
982 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
983
984 *buf++ = 1; /* LONGLBA */
985 buf += 2;
986 *buf++ = 16;
987 put_unaligned_be64(blocks, buf);
988 buf += 12;
989 put_unaligned_be32(block_size, buf);
990
991 return 17;
992}
993
994static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
995{
996 struct se_device *dev = cmd->se_dev;
997 char *cdb = cmd->t_task_cdb;
998 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
999 int type = dev->transport->get_device_type(dev);
1000 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
1001 bool dbd = !!(cdb[1] & 0x08);
1002 bool llba = ten ? !!(cdb[1] & 0x10) : false;
1003 u8 pc = cdb[2] >> 6;
1004 u8 page = cdb[2] & 0x3f;
1005 u8 subpage = cdb[3];
1006 int length = 0;
1007 int ret;
1008 int i;
1009
1010 memset(buf, 0, SE_MODE_PAGE_BUF);
1011
1012 /*
1013 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1014 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1015 */
1016 length = ten ? 3 : 2;
1017
1018 /* DEVICE-SPECIFIC PARAMETER */
1019 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1020 spc_modesense_write_protect(&buf[length], type);
1021
1022 /*
1023 * SBC only allows us to enable FUA and DPO together. Fortunately
1024 * DPO is explicitly specified as a hint, so a noop is a perfectly
1025 * valid implementation.
1026 */
1027 if (target_check_fua(dev))
1028 spc_modesense_dpofua(&buf[length], type);
1029
1030 ++length;
1031
1032 /* BLOCK DESCRIPTOR */
1033
1034 /*
1035 * For now we only include a block descriptor for disk (SBC)
1036 * devices; other command sets use a slightly different format.
1037 */
1038 if (!dbd && type == TYPE_DISK) {
1039 u64 blocks = dev->transport->get_blocks(dev);
1040 u32 block_size = dev->dev_attrib.block_size;
1041
1042 if (ten) {
1043 if (llba) {
1044 length += spc_modesense_long_blockdesc(&buf[length],
1045 blocks, block_size);
1046 } else {
1047 length += 3;
1048 length += spc_modesense_blockdesc(&buf[length],
1049 blocks, block_size);
1050 }
1051 } else {
1052 length += spc_modesense_blockdesc(&buf[length], blocks,
1053 block_size);
1054 }
1055 } else {
1056 if (ten)
1057 length += 4;
1058 else
1059 length += 1;
1060 }
1061
1062 if (page == 0x3f) {
1063 if (subpage != 0x00 && subpage != 0xff) {
1064 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1065 return TCM_INVALID_CDB_FIELD;
1066 }
1067
1068 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1069 /*
1070 * Tricky way to say all subpage 00h for
1071 * subpage==0, all subpages for subpage==0xff
1072 * (and we just checked above that those are
1073 * the only two possibilities).
1074 */
1075 if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1076 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1077 if (!ten && length + ret >= 255)
1078 break;
1079 length += ret;
1080 }
1081 }
1082
1083 goto set_length;
1084 }
1085
1086 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1087 if (modesense_handlers[i].page == page &&
1088 modesense_handlers[i].subpage == subpage) {
1089 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1090 goto set_length;
1091 }
1092
1093 /*
1094 * We don't intend to implement:
1095 * - obsolete page 03h "format parameters" (checked by Solaris)
1096 */
1097 if (page != 0x03)
1098 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1099 page, subpage);
1100
1101 return TCM_UNKNOWN_MODE_PAGE;
1102
1103set_length:
1104 if (ten)
1105 put_unaligned_be16(length - 2, buf);
1106 else
1107 buf[0] = length - 1;
1108
1109 rbuf = transport_kmap_data_sg(cmd);
1110 if (rbuf) {
1111 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1112 transport_kunmap_data_sg(cmd);
1113 }
1114
1115 target_complete_cmd_with_length(cmd, GOOD, length);
1116 return 0;
1117}
1118
1119static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1120{
1121 char *cdb = cmd->t_task_cdb;
1122 bool ten = cdb[0] == MODE_SELECT_10;
1123 int off = ten ? 8 : 4;
1124 bool pf = !!(cdb[1] & 0x10);
1125 u8 page, subpage;
1126 unsigned char *buf;
1127 unsigned char tbuf[SE_MODE_PAGE_BUF];
1128 int length;
1129 sense_reason_t ret = 0;
1130 int i;
1131
1132 if (!cmd->data_length) {
1133 target_complete_cmd(cmd, GOOD);
1134 return 0;
1135 }
1136
1137 if (cmd->data_length < off + 2)
1138 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1139
1140 buf = transport_kmap_data_sg(cmd);
1141 if (!buf)
1142 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1143
1144 if (!pf) {
1145 ret = TCM_INVALID_CDB_FIELD;
1146 goto out;
1147 }
1148
1149 page = buf[off] & 0x3f;
1150 subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1151
1152 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1153 if (modesense_handlers[i].page == page &&
1154 modesense_handlers[i].subpage == subpage) {
1155 memset(tbuf, 0, SE_MODE_PAGE_BUF);
1156 length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1157 goto check_contents;
1158 }
1159
1160 ret = TCM_UNKNOWN_MODE_PAGE;
1161 goto out;
1162
1163check_contents:
1164 if (cmd->data_length < off + length) {
1165 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1166 goto out;
1167 }
1168
1169 if (memcmp(buf + off, tbuf, length))
1170 ret = TCM_INVALID_PARAMETER_LIST;
1171
1172out:
1173 transport_kunmap_data_sg(cmd);
1174
1175 if (!ret)
1176 target_complete_cmd(cmd, GOOD);
1177 return ret;
1178}
1179
1180static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1181{
1182 unsigned char *cdb = cmd->t_task_cdb;
1183 unsigned char *rbuf;
1184 u8 ua_asc = 0, ua_ascq = 0;
1185 unsigned char buf[SE_SENSE_BUF];
1186 bool desc_format = target_sense_desc_format(cmd->se_dev);
1187
1188 memset(buf, 0, SE_SENSE_BUF);
1189
1190 if (cdb[1] & 0x01) {
1191 pr_err("REQUEST_SENSE description emulation not"
1192 " supported\n");
1193 return TCM_INVALID_CDB_FIELD;
1194 }
1195
1196 rbuf = transport_kmap_data_sg(cmd);
1197 if (!rbuf)
1198 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1199
1200 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1201 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1202 ua_asc, ua_ascq);
1203 else
1204 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1205
1206 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1207 transport_kunmap_data_sg(cmd);
1208
1209 target_complete_cmd(cmd, GOOD);
1210 return 0;
1211}
1212
1213sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1214{
1215 struct se_dev_entry *deve;
1216 struct se_session *sess = cmd->se_sess;
1217 struct se_node_acl *nacl;
1218 struct scsi_lun slun;
1219 unsigned char *buf;
1220 u32 lun_count = 0, offset = 8;
1221 __be32 len;
1222
1223 buf = transport_kmap_data_sg(cmd);
1224 if (cmd->data_length && !buf)
1225 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1226
1227 /*
1228 * If no struct se_session pointer is present, this struct se_cmd is
1229 * coming via a target_core_mod PASSTHROUGH op, and not through
1230 * a $FABRIC_MOD. In that case, report LUN=0 only.
1231 */
1232 if (!sess)
1233 goto done;
1234
1235 nacl = sess->se_node_acl;
1236
1237 rcu_read_lock();
1238 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1239 /*
1240 * We determine the correct LUN LIST LENGTH even once we
1241 * have reached the initial allocation length.
1242 * See SPC2-R20 7.19.
1243 */
1244 lun_count++;
1245 if (offset >= cmd->data_length)
1246 continue;
1247
1248 int_to_scsilun(deve->mapped_lun, &slun);
1249 memcpy(buf + offset, &slun,
1250 min(8u, cmd->data_length - offset));
1251 offset += 8;
1252 }
1253 rcu_read_unlock();
1254
1255 /*
1256 * See SPC3 r07, page 159.
1257 */
1258done:
1259 /*
1260 * If no LUNs are accessible, report virtual LUN 0.
1261 */
1262 if (lun_count == 0) {
1263 int_to_scsilun(0, &slun);
1264 if (cmd->data_length > 8)
1265 memcpy(buf + offset, &slun,
1266 min(8u, cmd->data_length - offset));
1267 lun_count = 1;
1268 }
1269
1270 if (buf) {
1271 len = cpu_to_be32(lun_count * 8);
1272 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1273 transport_kunmap_data_sg(cmd);
1274 }
1275
1276 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
1277 return 0;
1278}
1279EXPORT_SYMBOL(spc_emulate_report_luns);
1280
1281static sense_reason_t
1282spc_emulate_testunitready(struct se_cmd *cmd)
1283{
1284 target_complete_cmd(cmd, GOOD);
1285 return 0;
1286}
1287
1288sense_reason_t
1289spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1290{
1291 struct se_device *dev = cmd->se_dev;
1292 unsigned char *cdb = cmd->t_task_cdb;
1293
1294 if (!dev->dev_attrib.emulate_pr &&
1295 ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1296 (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1297 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1298 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1299 return TCM_UNSUPPORTED_SCSI_OPCODE;
1300 }
1301
1302 switch (cdb[0]) {
1303 case MODE_SELECT:
1304 *size = cdb[4];
1305 cmd->execute_cmd = spc_emulate_modeselect;
1306 break;
1307 case MODE_SELECT_10:
1308 *size = get_unaligned_be16(&cdb[7]);
1309 cmd->execute_cmd = spc_emulate_modeselect;
1310 break;
1311 case MODE_SENSE:
1312 *size = cdb[4];
1313 cmd->execute_cmd = spc_emulate_modesense;
1314 break;
1315 case MODE_SENSE_10:
1316 *size = get_unaligned_be16(&cdb[7]);
1317 cmd->execute_cmd = spc_emulate_modesense;
1318 break;
1319 case LOG_SELECT:
1320 case LOG_SENSE:
1321 *size = get_unaligned_be16(&cdb[7]);
1322 break;
1323 case PERSISTENT_RESERVE_IN:
1324 *size = get_unaligned_be16(&cdb[7]);
1325 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1326 break;
1327 case PERSISTENT_RESERVE_OUT:
1328 *size = get_unaligned_be32(&cdb[5]);
1329 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1330 break;
1331 case RELEASE:
1332 case RELEASE_10:
1333 if (cdb[0] == RELEASE_10)
1334 *size = get_unaligned_be16(&cdb[7]);
1335 else
1336 *size = cmd->data_length;
1337
1338 cmd->execute_cmd = target_scsi2_reservation_release;
1339 break;
1340 case RESERVE:
1341 case RESERVE_10:
1342 /*
1343 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1344 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1345 */
1346 if (cdb[0] == RESERVE_10)
1347 *size = get_unaligned_be16(&cdb[7]);
1348 else
1349 *size = cmd->data_length;
1350
1351 cmd->execute_cmd = target_scsi2_reservation_reserve;
1352 break;
1353 case REQUEST_SENSE:
1354 *size = cdb[4];
1355 cmd->execute_cmd = spc_emulate_request_sense;
1356 break;
1357 case INQUIRY:
1358 *size = get_unaligned_be16(&cdb[3]);
1359
1360 /*
1361 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1362 * See spc4r17 section 5.3
1363 */
1364 cmd->sam_task_attr = TCM_HEAD_TAG;
1365 cmd->execute_cmd = spc_emulate_inquiry;
1366 break;
1367 case SECURITY_PROTOCOL_IN:
1368 case SECURITY_PROTOCOL_OUT:
1369 *size = get_unaligned_be32(&cdb[6]);
1370 break;
1371 case EXTENDED_COPY:
1372 *size = get_unaligned_be32(&cdb[10]);
1373 cmd->execute_cmd = target_do_xcopy;
1374 break;
1375 case RECEIVE_COPY_RESULTS:
1376 *size = get_unaligned_be32(&cdb[10]);
1377 cmd->execute_cmd = target_do_receive_copy_results;
1378 break;
1379 case READ_ATTRIBUTE:
1380 case WRITE_ATTRIBUTE:
1381 *size = get_unaligned_be32(&cdb[10]);
1382 break;
1383 case RECEIVE_DIAGNOSTIC:
1384 case SEND_DIAGNOSTIC:
1385 *size = get_unaligned_be16(&cdb[3]);
1386 break;
1387 case WRITE_BUFFER:
1388 *size = get_unaligned_be24(&cdb[6]);
1389 break;
1390 case REPORT_LUNS:
1391 cmd->execute_cmd = spc_emulate_report_luns;
1392 *size = get_unaligned_be32(&cdb[6]);
1393 /*
1394 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1395 * See spc4r17 section 5.3
1396 */
1397 cmd->sam_task_attr = TCM_HEAD_TAG;
1398 break;
1399 case TEST_UNIT_READY:
1400 cmd->execute_cmd = spc_emulate_testunitready;
1401 *size = 0;
1402 break;
1403 case MAINTENANCE_IN:
1404 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1405 /*
1406 * MAINTENANCE_IN from SCC-2
1407 * Check for emulated MI_REPORT_TARGET_PGS
1408 */
1409 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1410 cmd->execute_cmd =
1411 target_emulate_report_target_port_groups;
1412 }
1413 *size = get_unaligned_be32(&cdb[6]);
1414 } else {
1415 /*
1416 * GPCMD_SEND_KEY from multi media commands
1417 */
1418 *size = get_unaligned_be16(&cdb[8]);
1419 }
1420 break;
1421 case MAINTENANCE_OUT:
1422 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1423 /*
1424 * MAINTENANCE_OUT from SCC-2
1425 * Check for emulated MO_SET_TARGET_PGS.
1426 */
1427 if (cdb[1] == MO_SET_TARGET_PGS) {
1428 cmd->execute_cmd =
1429 target_emulate_set_target_port_groups;
1430 }
1431 *size = get_unaligned_be32(&cdb[6]);
1432 } else {
1433 /*
1434 * GPCMD_SEND_KEY from multi media commands
1435 */
1436 *size = get_unaligned_be16(&cdb[8]);
1437 }
1438 break;
1439 default:
1440 return TCM_UNSUPPORTED_SCSI_OPCODE;
1441 }
1442
1443 return 0;
1444}
1445EXPORT_SYMBOL(spc_parse_cdb);
1446